Debugging issues encountered during the "R CMD check" process

I read through the "Writing R Extensions" and the "Debugging in R" website (http://www.stats.uwo.ca/faculty/murdoch/software/debuggingR/), looking for some hints about how to solve the issue of debugging problems encountered during the "R CMD check" process, but nothing seems to be mentioned about addressing issues encountered. 

Specifically, I am working with the R signal package which is hosted at the following location:
http://code.google.com/p/r-signal/

I would like to debug the problem that is shown below, and is encountered when I run "R CMD check signal". 

Thank you for any insights that are provided as the R signal package is nice and it would be good to have it working again with R 2.9.x and beyond. 

Thank you again for the help. 

From the 00check.log

* using log directory '/Users/jasonkrupert/Documents/RStuff/Rsignal/r-signal/signal.Rcheck'
* using R version 2.9.2 (2009-08-24)
* using session charset: UTF-8
* checking for file 'signal/DESCRIPTION' ... OK
* checking extension type ... Package
* this is package 'signal' version '0.6'
* checking package dependencies ... OK
* checking if this is a source package ... WARNING
....
....
....

### Name: interp
### Title: Interpolate / Increase the sample rate
### Aliases: interp
### Keywords: math

### ** Examples


# The graph shows interpolated signal following through the
# sample points of the original signal.
t = seq(0, 2, by = 0.01)
x = chirp(t,2,.5,10,'quadratic') + sin(2*pi*t*0.4)
y = interp(x[seq(1, length(x), by = 4)],4,4,1)   # interpolate a sub-sample

Warning in rbind(x, array(val, dim = c(n - nx, NCOL(x)))) :
  number of columns of result is not a multiple of vector length (arg 1)
Warning in Fft(postpad(x, N)) * B :
  longer object length is not a multiple of shorter object length
Error in ifft(Fft(postpad(x, N)) * B) : 
  dims [product 36] do not match the length of object [256]
Calls: interp -> fftfilt -> fftfiltx -> ifft
Execution halted